From bead to rod: Comparison of theories by measuring translational drag coefficients of micron-sized magnetic bead-chains in Stokes flow
Fig 5
Bead model and ellipsoid model theories and measurements.
(a): Schematic of the bead model and ellipsoid model theoretical frameworks representing rod-like objects. Bead model is a rigid array of identical touching beads each with diameter 2r; ellipsoid model is composed of major axis L/2 and minor axis r; Chain length in bead model in terms of number of beads N is equivalent to aspect ratio of ellipsoid L/(2r). (b): Experimental values for (red color dots) plotted along with experimental values for
(cyan color dots) versus chain length N. Theoretical curves are from Eqs 14 and 15 substituted with appropriate values of γ based on bead model and ellipsoid model as listed in Table 1, and HYDRO++ values in Table 2.